You mean, rake, not rakeback. Rakeback is the amount of rake you get paid back. It's usually based on the MGR (average rake at the table) but Fullt Tilt just switched to the actual rake paid. So if you paid $382.51 in rake (at FT) you'd get about $103 in rakeback deposited to your account. Pokerstars
does not give you rakeback, but you pay significantly less in rake in those micro games. You do get VPP's though, which can be used to purchase items or bonuses or tournament tickets, but they're not as good as rakeback. You've spent about 80 hours playing, so they're still making less than $5 an hour in rake from you. This is pretty standard, and isn't super expensive. They have millions of dollars in staff and equipment to support.